Is defined in the Data Communications Company User Interface Specification.
The DCC shall retry at least once within a period of 300 seconds.
If the DCC is unable to deliver the Device Alert to the User after 300 seconds
from the first DCC attempt, then the DCC shall queue the Device Alert on the
failed queue for re-delivery once User connection is restored. The DCC shall
raise a Service Management Event within the DCC Systems for resolution and
periodically monitor the failed queues of Device Alerts and release these to
Users if and when the User connection is restored.
The DCC shall hold failed Device Alerts for 2 days for re-delivery. After this
period the failure will be recorded within the DCC Systems as a Service